F.O.B's

Hello,
I was just wondering if anyone actually shoots these F.O.B's for competitions or otherwise? They look goofy and I don't actually believe they work how people claim they do. Just wanted to get some opinions if anyone has any.Thanks.

I know a guy that uses them. He uses them mainly for hunting now and swears by them. He said he'd use them for 3D but they get broken up pretty bad when everyone puts their shots where they're supposed to go.

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